Ash is intended to see a few mini-expansions that add some quests and focus on a small "dungeon" expansion off the side of the main areas. Dungeons are linear or mostly linear sets of areas with an ultimate goal at the end. Bonus points for some new story element being added or an existing line pushed forward with each expansion.
I also haven't done any serious tweaking or balancing of Ash since it came out, and that is overdue. Probably before any expansion since the amount of work involved in that is significantly lower.